The Good, the Bad, and the Neutral: Recognizing Utah Arthropods and Their Roles in Orchard and Field Ecology Shawn Steffan
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1 The Good, the Bad, and the Neutral: Recognizing Utah Arthropods and Their Roles in Orchard and Field Ecology Shawn Steffan IPM Project Leader Utah State University Logan, Utah
2 An Overview of Today s Talk Terms, Definitions. Stand-out characteristics of many beneficial arthropods. Developmental stage and ecological context. Common groups of natural enemies. (Recognize immature stages.) (Important arthropods in Utah.)
3 Life-History Strategies Predator: consumes (kills) two or more individuals to complete its development. Parasitoid: consumes (kills) exactly one individual to complete its development. Parasite: consumes but generally does not cause the death of one or more individuals. (What is the most important group of insect-eating animals?)
4 Stand-out Characteristics of Many Beneficial Arthropods Parasitoids: The beneficial stage is the larva (although adult females of certain species can host-feed). Host-specificity Micro-environment specificity Endo- and ecto-parasitism Ovipositor specialization (e.g., Hymenoptera). Gregarious egg-laying, polyembryony. Predators (in general): The beneficial stage may be either the immature, the adult, or both. Raptorial forelegs. (e.g., Hemiptera, Mantodea) Forward-oriented mouthparts (e.g., Hemiptera, Neuroptera). Chewing mouthparts (e.g., Coleoptera). Sucking/rasping mouthparts (e.g., Diptera). Relatively large, well-developed eyes. Well-developed legs for running, climbing, jumping.
5 Consider the Developmental Stage and Ecological Context In general, beneficial arthropods can be relied upon to serve specific functions at specific times. Parasitoids typically target very specific stages of a narrow range of host species. Predators generally target a wider range, although there are often particular prey groups on which predators will focus. However, predation can be on nonpests (coccinellids feeding on aphids), or on other predator species (robber fly feeding on a yellow-jacket), on their own species (dragonflies), or on their own siblings (lacewing larvae). A pest at one point in the season can become a beneficial later, depending on available resources. Hungry earwigs combing over apples for codling moth eggs. Campylomma nymphs Likewise, a beneficial species can become troublesome if it begins disrupting/eating other beneficials. Ants defending aphids, mealybugs, or caterpillars. Neutral adults of certain species may produce highly predaceous progeny.
6 The Predominant Terrestrial Predator- Groups Hymenoptera (wasps and ants) Hemiptera (true bugs) Coleoptera (beetles) Neuroptera (lacewing larvae) Phytoseiid Mites (predatory mites) Diptera (tachinid flies, robber flies, midges) Odonata (dragonflies) Mantodea (mantids)
7 Wasps and Ants (Hymenoptera) Parasitic wasps Ants Social and solitary wasps. (Are there any plant-eating Hymenoptera?)
8 True Bugs (Hemiptera) Assassin bugs, ambush bugs. Damsel bugs. Big-eyed bugs. Minute pirate bugs. Soldier bugs and stink bugs (certain species). Miridae (predominantly plant feeders, but also very opportunistic omnivores).
9 Beetles (Coleoptera) Ground beetles (carabids, roves) Lady beetles Mealybug destroyers Spider mite destroyers (see mounted specimens) Soldier Beetles
10 Lacewings (Neuroptera) Green lacewing larvae Brown lacewing Antlions
11 Predatory Mites (Phytoseiidae) Western predatory mite: Metaseiulus (=Galendromus=Typhlodromus) occidentalis Phytoseiulus persimilis (Are herbivorous mites the only plant-eating arachnids?) Yes.
12 Flies (Diptera) Asilids (robber flies) Parasitoids (macro- and micro-type eggs) Syrphids (hover flies) Cecidomyiids (midges)
13 Other Predators Earwigs Dragonflies Mantids Spiders Snakeflies
14 Take-home Points Try to identify and foster populations of natural enemies in the garden, field, or orchard (even if they are a nuisance, such as spiders, ants, and wasps). Bear in mind that natural enemies may not be feeding on the critical pest species. Agriculturally important natural enemies are often parasitoids because these species are very host-specific. Co-evolution seems to have built enough inefficiency into predator-prey relations that natural enemies rarely drive their prey to local extinction. Economic injury levels determine the degree to which control is left to natural enemies. Keep a field guide handy.
15 Encarsia formosa parasitizing whiteflies
16 Developmental Stages of an Assassin Bug
17 Lygus Bug (Lygus spp.)
18 Big-Eyed Bugs (Geocoris spp.)
19 Metaseiulus occidentalis
20 Phytoseiulus persimilis
21 Sixspotted Thrips and Damsel Bugs: Predaceous as Nymphs and Adults
22 Minute Pirate Bug (Orius spp.)
23 Social Insects: Adults Forage/Hunt on Behalf of Immatures
24 Developmental Stages of the Convergent Lady Beetle
25 Intra-specific Cannibalism
26 Predaceous Larvae/Neutral Adult (Lacewing and Hover fly)
27 Aphid parasitoid emerging from aphid mummy.
28 Lacewing Larva Eating Corn Earworm Larva
29 Soldier Beetle, Adult (Cantharidae)
30 Soldier Beetle (Cantharidae)
31 Earwig Adult (Dermaptera)
32 Inter-specific Predation (robber fly)
33 Brown Lacewing
34 Mealybug Destroyer (Cryptolaemus montrouzieri)
35 Praying Mantid (Mantodea)
36 Tachinid Fly
37 Snakefly Adult (Raphidiidae)
38 Typical Predator Traits: Raptorial Forelegs and Pronounced Rostrum
39 Raptorial Forelegs Do all arthropods with raptorial-like forelegs use them for capturing prey? No. (See cicada nymphs and lice.)
40 Common Ground Beetle (Carabidae)
41 Egg Parasitoid (Trichogramma spp.)
42 Larval Parasitoid (Hyposeter exiguae)
43 Caterpillar Egg?
44 Goniozus legneri searches rotting nuts and fruit for navel orangeworms.
45 Aphytis and Encarsia: Ecto- and endoparasitoids of San Jose scale.
46 Encarsia pupa inside scale body
47 Aphytis larvae and pupae
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